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Amateur baseball teams face off on the site of the former Tigers Stadium in late summer 2010. After the demolition of the stadium, locals took it upon themselves to clean up the site and put it to use. (2010)

Over the next couple of weeks, The Atlantic Cities is exploring America's rebuilding efforts in a four-part series.

A couple of sharp-eyed Midwestern academics spotted the first green shoots of a national urban rebuild three years ago.

In mid-2009, Chicago sociologist and photographer David Schalliol and Milwaukee-based urban historian Michael Carriere launched a collaborative study of creative revitalization efforts in urban areas across the country, particularly those hardest hit by decline. They've since visited more than 30 cities and turned up nearly 200 outfits and initiatives, creating a national map of grassroots renewal, from Albuquerque to Providence.

"We're seeing this huge number of groups, this ubiquity of DIY development,” says Schalliol, who is working toward a sociology doctorate at the University of Chicago. “We seem to have reached a new moment, where this kind of community-based and community-directed activism is playing a larger role in shaping the possibilities and facilitating a variety of new opportunities, from play to work to food to housing."

Some are sustainable businesses looking to redevelop a fallen neighborhood, while others are slapdash, activist-bred pop-ups that quickly come and go. Many are small-scale, longer-lasting efforts – such as turning a demolition site into a park, or reclaiming unused or abandoned buildings for housing or recreation activities.